Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
LUPKYNIS vs PROTOPIC
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Calcineurin inhibitor immunosuppressant that binds to cyclophilin A, inhibiting calcineurin activity, which prevents dephosphorylation and activation of nuclear factor of activated T-cells (NFAT), thereby reducing cytokine production and T-cell activation.
Tacrolimus, a calcineurin inhibitor, binds to FKBP-12 and inhibits calcineurin, thereby blocking dephosphorylation and nuclear translocation of NFAT, reducing transcription of pro-inflammatory cytokines (e.g., IL-2, IFN-γ) in T-cells.
Treatment of lupus nephritis in combination with a background immunosuppressive therapy
Moderate to severe atopic dermatitis in non-immunocompromised patients where conventional therapy is inadvisable or ineffective,Prophylaxis of organ rejection in kidney or liver transplantation (systemic use, not topical),Off-label: Treatment of vitiligo, psoriasis, eczema of the face and neck (short-term)
23.7 mg orally twice daily with food.
Apply a thin layer of 0.03% or 0.1% ointment to affected areas twice daily. Discontinue when lesions resolve. For adults, use 0.03% or 0.1%; 0.1% is not indicated for children.
Terminal elimination half-life approximately 30 hours; supports once-daily dosing; steady-state reached by day 4.
Terminal half-life ranges from 6–20 hours in pediatric atopic dermatitis patients; prolonged in hepatic impairment (mean 8–35 hours).
Primarily metabolized by CYP3A4; minor contribution from CYP3A5.
Primarily hepatic via CYP3A4; also metabolized by CYP3A5. Topical absorption results in minimal systemic exposure, but systemic metabolism follows oral route.
Primarily hepatic metabolism; <1% excreted unchanged in urine; approximately 66% of total radioactivity recovered in feces (mainly metabolites) and 22% in urine (mainly metabolites).
Primarily fecal (biliary) elimination of metabolites; <1% of parent drug excreted unchanged in urine.
Greater than 99% bound to plasma proteins, primarily albumin and alpha-1-acid glycoprotein.
99% bound primarily to albumin and alpha-1-acid glycoprotein.
Apparent Vd/F ~24 L (approximately 0.34 L/kg assuming 70 kg); indicates distribution into tissues.
Vd/F ~ 30–50 L/kg after oral administration, indicating extensive tissue distribution; topical absorption negligible.
Oral bioavailability approximately 35% (range 20–50%) under fasting conditions; high-fat meal reduces Cmax and AUC by about 50%.
Systemic bioavailability after topical application is <0.5% in adults with intact skin; increases in compromised skin barrier.
No dose adjustment required for GFR ≥30 m L/min. Avoid use in severe renal impairment (GFR <30 m L/min) due to lack of data.
No dose adjustment required. Tacrolimus is not significantly renally excreted and systemic absorption is minimal.
Child-Pugh Class A: No adjustment. Child-Pugh Class B: Reduce dose to 15.8 mg orally twice daily. Child-Pugh Class C: Not recommended.
No specific dose adjustment for Child-Pugh class A or B. For severe hepatic impairment (Child-Pugh C), use with caution; consider starting at lower concentration (0.03%) due to potential increased systemic exposure.
Safety and efficacy not established in pediatric patients; no approved dose.
Children (2-15 years): Apply 0.03% ointment twice daily. Do not use 0.1% in this age group. For children 2 years and older.
No specific dose adjustment required; monitor renal function due to age-related decline.
No specific dose adjustment required. Use minimum effective amount; monitor for cutaneous infections.
Increased risk of infection and lymphoma; increased risk of nephrotoxicity and hypertension; increased risk of neurotoxicity.
Long-term safety of topical calcineurin inhibitors has not been established. Although a causal relationship has not been established, rare cases of malignancy (e.g., lymphoma, skin cancer) have been reported in patients treated with topical calcineurin inhibitors. Therefore, continuous long-term use should be avoided, and application should be limited to areas of involvement.
Nephrotoxicity and hypertension require regular monitoring. Neurotoxicity including posterior reversible encephalopathy syndrome (PRES). Increased susceptibility to infections including opportunistic infections. Malignancies including lymphoma. Monitor for Epstein-Barr virus serology. Use with caution with CYP3A4 inhibitors and inducers. Avoid live vaccines.
Increased risk of infections (including herpes simplex, eczema herpeticum); avoid use on malignant or premalignant skin conditions; use with caution in patients with netherton syndrome; may cause photosensitivity; avoid concurrent UV exposure; monitor for lymphadenopathy; not for use in children <2 years (safety not established).
Concurrent use with chronic immunosuppressive therapies other than mycophenolate mofetil (MMF) or mycophenolic acid (MPA). Known hypersensitivity to voclosporin or any component of the formulation.
Hypersensitivity to tacrolimus or any component of the formulation; use in patients with known or suspected malignancy at the application site; use in immunocompromised patients (relative).
Avoid grapefruit and grapefruit juice as they increase voclosporin exposure. No other specific food interactions are known.
No known food interactions with topical PROTOPIC. However, if absorbed systemically (rare), grapefruit juice may increase tacrolimus levels; avoid excessive consumption of grapefruit juice while using PROTOPIC.
LUPKYNIS (voclosporin) is a calcineurin inhibitor. Based on animal studies, there is a risk of fetal harm in all trimesters. In rats and rabbits, voclosporin administration during organogenesis resulted in increased embryofetal mortality and reduced fetal weight at maternally toxic doses. There are no adequate human studies. Avoid use during pregnancy unless potential benefit outweighs risk.
Pregnancy Category C. Animal studies have shown embryotoxicity and teratogenicity at systemic exposures below human therapeutic levels. No adequate human studies in pregnant women. Risk cannot be ruled out; use only if potential benefit justifies potential risk to fetus. First trimester: avoid if possible. Second and third trimesters: limited data; systemic absorption minimal with topical use, but theoretical risk remains.
It is unknown if voclosporin is excreted in human milk. In animal studies, voclosporin and its metabolites were detected in milk of lactating rats. No M/P ratio available for humans. Due to potential for serious adverse reactions in nursing infants, advise women not to breastfeed during treatment and for 4 weeks after last dose.
Not known if tacrolimus is excreted in human milk after topical administration. Systemic absorption is minimal (<0.5%), but caution is advised due to potential for infant immunosuppression. M/P ratio: not available. Consider benefit of breast-feeding vs risk of infant exposure.
No specific dose adjustments are established for pregnancy. However, pregnancy can increase voclosporin clearance due to expanded plasma volume and enhanced metabolism. Consider therapeutic drug monitoring if available, and adjust dose to maintain therapeutic trough levels (target 30-60 ng/m L) as needed.
No specific dose adjustments recommended for topical use due to minimal systemic absorption. However, limit application to smallest area and shortest duration needed. Avoid use on large areas, broken skin, or under occlusion to reduce systemic exposure.
Monitor for hematuria, proteinuria, and e GFR during treatment. Lupkynis (voclosporin) is a calcineurin inhibitor; do not co-administer with other CNIs or strong CYP3A4 inhibitors. Reduce dose in patients with e GFR <45 m L/min per 1.73 m². Concomitant use with mycophenolate mofetil and corticosteroids is standard. Check blood pressure and serum potassium regularly. Live vaccines contraindicated.
PROTOPIC (tacrolimus) is a topical calcineurin inhibitor used for atopic dermatitis. It is steroid-sparing, thus avoiding skin atrophy and tachyphylaxis. Apply as a thin layer to affected areas. Avoid occlusive dressings. Can be used on face, neck, and intertriginous areas where topical steroids are riskier. Monitor for burning/stinging upon application, which often improves with continued use. Warn patients about rare risk of lymphoma and skin malignancy; use only as second-line therapy for short-term and intermittent treatment. Do not use in immunocompromised patients or those with active skin infections.
Take exactly as prescribed; do not stop or change dose without consulting your doctor.,You will need regular blood and urine tests to monitor kidney function and drug levels.,Report any signs of infection (fever, sore throat), high blood pressure (severe headache, vision changes), or changes in urine output/color.,Avoid grapefruit and grapefruit juice during treatment.,Do not receive live vaccines while taking this medication.,Use effective contraception during treatment and for 12 weeks after last dose if of childbearing potential.,Tell your doctor about all medications, including over-the-counter drugs and supplements.
Apply PROTOPIC exactly as prescribed; do not use more than directed.,Wash hands after application unless treating hands.,Do not cover treated area with bandages or dressings unless instructed.,Expect mild burning or stinging especially in the first few days; this usually resolves with continued use.,Avoid sun exposure and use sunscreen; protect treated areas from natural and artificial sunlight.,Do not use on infected skin; tell your doctor if you have an infection.,PROTOPIC is for external use only; do not get in eyes, mouth, or nose.,Inform your doctor if you are pregnant, planning to become pregnant, or breastfeeding.,Store at room temperature away from moisture and heat.,Report any signs of skin infection, rash, or swollen lymph nodes to your doctor immediately.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about LUPKYNIS vs PROTOPIC, answered by our medical review team.
LUPKYNIS is a Calcineurin Inhibitor Immunosuppressant that works by Calcineurin inhibitor immunosuppressant that binds to cyclophilin A, inhibiting calcineurin activity, which prevents dephosphorylation and activation of nuclear factor of activated T-cells (NFAT), thereby reducing cytokine production and T-cell activation.. PROTOPIC is a Topical Calcineurin Inhibitor that works by Tacrolimus, a calcineurin inhibitor, binds to FKBP-12 and inhibits calcineurin, thereby blocking dephosphorylation and nuclear translocation of NFAT, reducing transcription of pro-inflammatory cytokines (e.g., IL-2, IFN-γ) in T-cells.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between LUPKYNIS and PROTOPIC depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of LUPKYNIS is: 23.7 mg orally twice daily with food.. The standard adult dose of PROTOPIC is: Apply a thin layer of 0.03% or 0.1% ointment to affected areas twice daily. Discontinue when lesions resolve. For adults, use 0.03% or 0.1%; 0.1% is not indicated for children.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between LUPKYNIS and PROTOPIC in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. LUPKYNIS is classified as Category C. LUPKYNIS (voclosporin) is a calcineurin inhibitor. Based on animal studies, there is a risk of fetal harm in all trimesters. In rats and rabbits, voclosporin administration during . PROTOPIC is classified as Category C. Pregnancy Category C. Animal studies have shown embryotoxicity and teratogenicity at systemic exposures below human therapeutic levels. No adequate human studies in pregnant women.. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.